\begin{tikzpicture}
    \tkzDefPoints{0/0/B, 3/0/C}
    \tkzInterCC[R](B,4)(C,2.8)  \tkzGetFirstPoint{A}
    \tkzDefPointOnLine[pos=15/40](A,B)  \tkzGetPoint{D}
    \tkzDefLine[parallel=through D](B,C)  \tkzGetPoint{e}
    \tkzInterLL(A,C)(D,e)  \tkzGetPoint{E}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegment(D,E)
    \tkzLabelPoints[above](A)
    \tkzLabelPoints[left](B,D)
    \tkzLabelPoints[right](C,E)
\end{tikzpicture}

